Question

Sample data from a normal population are located in the Microsoft Excel Online file below. Use the data to answer the following questions for the σ unknown case.

8

12

14

18

19

16

17

3

1. The point estimate of the population mean is (to 2 decimals)

2. The standard deviation is (to 2 decimals)

3. The margin of error is (to 1 decimal)

4. The 95% confidence interval is (to 1 decimal)

Answer 1

	Values ( X )
	8	28.8906
	12	1.8906
	14	0.3906
	18	21.3906
	19	31.6406
	16	6.8906
	17	13.1406
	3	107.6406
Total	107	211.8748

Mean

Standard deviation

Point estimate =

Standard error =

Margin of error =

Confidence Interval



Lower Limit =
Lower Limit = 8.7755
Upper Limit =
Upper Limit = 17.9745
95% Confidence interval is ( 8.8 , 18.0 )